Half to arthur pratt jameson



(No Model.)

W A. D. GRAHAM.

BICYCLE TIRE.

N0. 595,300. Patented Dec. 14,1897.

Ira en ZDr 1 Win 65565 Urrrrnn STATES I PATENT OFFICE.

TVILLIAM A. D. GRAHAM,

OF OWEN SOUND, CANADA, ASSIGNOR OF ONE- IIALF TO ARTHUR PRATT JAMESON,

OF SOUTH DUMFRIES, CANADA.

BlCYCLE-TERE.

SPECIFICATION forming part of Letters Patent No. 595,300, dated December14, 1897'. Application filed February 5, 1894. Serial No. 499,219. (Nomodel.) Patented in England February 28, 1894, No. 4,245.

To aZZ whom it may concern.-

Beit known that I, WILLIAM A. D. GRAHAM, student, of Owen Sound, in thecounty of Grey and Province of Ontario, Canada, have invented certainnew and useful Improvements in Bicycle-Tires, (for which English PatentNo. 4,245, dated February 28, 1894, has been granted me;) and I herebydeclare that the following is a full, clear, and exact description ofthe same.

The object of this invention is to devise a pneumatic tire for cycles ofall descriptions, which will be comprised of an air-tube and an outercovering inclosing the air-tube, and to provide the adjacent meetingedges of the outer covering with an interlocking device by means ofwhich the said meeting edges can be locked together to form a completecovering for the air-tube and to provide that part of the outer coveringwhich will be adjacent to the rim with a bead or flange adapted to entera channel formed in the middle part of the rim, the whole device beingconstructed and arranged as hereinafter set forth, and more particularlypointed out in the claim.

In the drawings, Figure 1 is a sectional view of the device. Fig. 2 is aview of a section of the outer covering. Fig. 3 is a perspective view ofa section of the rim.

Like letters of reference refer to like parts throughout thespecification and drawings.

The invention consists of a rim A, having a concaved seat for the tireand a continuous channel l3, formed in the middle of the rim. The tireconsists of an air-tube C, of any'ordinary formation or style, inclosedby an outer covering D. Each of the adjacent meeting edges (Z d of theouter covering D is provided with a locking membere 6, respectivelyarranged on the opposite sides of the outer covering in order that whenthe said covering is wrapped around the air-tube into the positionindicated in Fig. 1 the said members e e will interlock and holdtogether the said adjacent meeting edges. The adjacent meeting edge clof the outer covering D,which is intended to be contiguous the rim A, isprovided with a bead or flange F, adapted to enter the channel B in therim A and prevent the tire being displaced sidewise from the said rimwhen the tire is partially or totally disinilated. By means of thisconstruction the outer covering can be secured to the rim and theair-tube securely locked within the outer covering without additioneitherto the weight of the wheel or cycle or to the cost of or laborinvolved in the manufacture of the cycle. It will be noticed byreference to the drawingsthat each lockin g member is sufficientlyremoved from its respective edge of the outer covering to permit theformation of a flange or strip between itself and the said edge. Thestrip between the locking member e and its meeting edge d is borneagainst the inner side of the outer covering by the pressure of theair-tube C when inflated, and the strip between the locking member 6 andthe edge d is pressed against the outer side of the outer covering bythe rim A. The pressure 011 these two strips is suflicient to hold theadjacent meeting edges against their respective parts of the outercovering and enable the locking members 8 e to securely interlock.

By referring to the views, Figs. 1 and 2, it will be observed that theouter covering D is thicker in its middle and the thickness graduallybecomes less toward each edge until the members 6 c are reached, whenthe thickness of the cover is abruptly made greater, thus forming themembers 6 6, one member extending in one direction and the other memberextending in the opposite direction. The thickness of both the members 6and e gradually becomes less until they terminate in the edges of thecover D. "hus when the members 6 and e are interlocked the thickportions of the said members c and 6 come in the thin parts of the coverD, and when the air is introduced in the tube C the pressure causes themembers to'firmly interlock and the joint proper is made in the middleof the tire and the inner edge of the member a extends into the tube C,and thus the cover D firmly grips the tube C and pre- 5 vents in thelatter any tendency to creep. The extreme ends extending one on eachside of the joint and each being firmly bound relieves the joint of someof the strain, and as both of the edges of the cover D diminish inthickness the cover on a section will assume a symmetrical shape whichwill bring the thickest part of the cover D squarely in the middle ofthe Wheel.

Having thus fully described my invention, WhatI claim as new, and desireto secure by Letters Patent, is-

In a tire for cycles the combination of the wheel-rim having a recesslocated in the periphery thereof, the air-tube; a covering for theair-tube consisting of a strip of flexible material having on oppositesides of its edges abrupt enlargements, both said enlargements graduallybecoming less in thickness and terminating in the extreme edges of thecover, said enlargements adapted to interlock with each other and in sodoing adapted to cause an edge of the inner enlargement to extend W. A.D. GRAHAM.

In presence of- O. H. Thomas, DONALD O. RIDOUT.

